TABLE D.1 Comparison of Methane Measurements

 

TCF

By Volume, m3

By Weight, Pg

Conventional natural gas (Methane)a

 

 

 

Global assessment of conventional methane in reserves and technically recoverable resources

16,000

4.4 × 1014

3.2 × 102

U. S. methane consumption in 2008

23

6.5 × 1011

4.7 × 10−1

Methane in methane hydrateb

 

 

 

Very early global estimates, based on many erroneous assumptions, of the methane content of gas hydrate

~35,000,000

~1018

~7.1 × 105

Recent range of global estimates of methane in methane hydrate

35,000 to 177,000

1 × 1015 to 5 × 1015

7.1 × 102 to 3.6 × 103

Mean MMS estimate of methane in hydrate in the Gulf of Mexico

21,000

6 × 1014

4.3 × 102

Mean U. S. Geological Survey estimate of technically recoverable methane from hydrate on the North Slope of Alaska

85.4

2.4 × 1012

1.7

Estimate of methane in hydrate, eastern Nankai Trough, Japan

40

1.14 × 1012

8.1 × 10−1

Atmospheric methanec

 

 

 

Atmospheric abundance of methane

~250

~7 × 1012

~5

Estimate of total global flux of methane from all sources entering the atmosphere per year

30

8.4 × 1011

0.6

Estimate of total global sink for all methane entering the atmosphere per year

29

8.1 × 1011

0.58

aSee Chapter 1.

bSee Chapter 2.

cFor discussion, see Kvenvolden, K. A. and B. W. Rogers. 2005. Gaia’s breath—global methane exhalations. Marine and Petroleum Geology 22: 579- 590.



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